English
聯系我們
網站地圖
郵箱
舊版回顧



全球大河僅三分之一可自由奔流

文章來源:科技日報 劉海英   發布時間:2019-05-10  【字號:     】  

  《自然》雜志上最新發表的一項研究顯示,世界上較長的246條河流中,目前僅有三分之一還能保持全程自由流動,越來越多的水壩和水庫正在減少健康河流為全人類提供的多種利益。

  這是科學家有史以來第一次對地球上河流自由流動的狀況進行評估。來自世界自然基金會(WWF)等機構的34名研究人員組成的國際團隊,利用衛星圖像和其他數據,對世界范圍內總流程達1200萬公里的河流的連通狀況進行了分析。他們發現,在全世界長度超過1000公里的246條河流中,僅有37%的河流還能不受阻礙地自由流動;在91條長度超過1000公里的入海河流中,只有21條還能保持從源頭到海洋的貫通。這些尚能自由流動的河流主要流經北極圈、亞馬遜和剛果盆地等偏遠地區;而在人口密集地區,只有伊洛瓦底江、薩爾溫江等少數大河還能自由流動。

  研究人員指出,全球河流形成了一個錯綜復雜的網絡,與土地、地下水和大氣有著重要聯系。自由流動的河流對人類和環境都很重要,不僅支撐淡水魚的繁衍,為數億人提供糧食安全保障,還能提供足夠多的沉積物,防止耕地流失,并維系豐富的生物多樣性。擾亂這些河流的連通性,往往會減少甚至消除其帶給人類和自然的各種好處。

  該研究還指出,水壩和水庫是全球河流連通性喪失的主要原因。目前全世界已建成的大型水壩有近6萬座,正在規劃或建造的大壩則超過3700座,這些人為設施讓許多江河無法自由奔流。此外,氣候變化也威脅著全球河流的健康,溫度上升已經影響到河流的流動模式、水質和生物多樣性。

  新研究提供了跟蹤自由流動河流狀況的數據和方法,有助于各國協調戰略,維護或恢復河流連通性。WWF科學家米歇爾·蒂米指出,目前許多國家致力于發展低碳經濟,迫切需要開發可再生能源,水電成為一個重要選擇,但考慮到河流及人類的可持續發展,規劃良好的風能和太陽能可能是更好的選擇。




(責任編輯:侯茜)

附件:

專題推薦

相關新聞


© 1996 - 中國科學院 版權所有 京ICP備05002857號  京公網安備110402500047號  聯系我們

地址:北京市三里河路52號 郵編:100864

人人彩票www.rrle9.com www.nw06.com | www.88713.cc | www.587059.com | www.441224.com | www.934938.com | www.870744.com | www.191620.com | 948174.com | www.366970.com | www.0501.top | www.206563.com | www.28db.com | www.96132.cc | www.997864.com | www.ia43.com | www.701417.com | www.287308.com | 398585.com | www.658081.com | www.35dt.com | www.47oo.com | www.108739.com | www.94460.com | www.973498.com | 675103.com | 881757.com | 234815.com | 彩乐坊www.542511.com | www.1315.me | www.043778.com | www.965436.com | www.18181.com | www.961321.com | 764899.com | 梦想彩票www.33112g.com | 232593.com | www.xj78.cc | 787448.com | www.356524.com | 574442.com | www.786171.com | www.7870.vip | www.855897.com | 619406.com | www.4200.vip | www.125242.com | www.517441.com | www.mi46.com | www.95556.com | www.871636.com | www.cf26.com | www.62al.com | 823730.com | www.740878.com | www.80210.com | www.00tl.com | 凤凰彩票www.77803h.com | 869507.com | www.0zx.com | www.586241.com | www.804746.com | www.860525.com | 640036.com | www.502496.com | www.a06.top | www.188006.com | www.680820.com | www.479234.com | www.857489.com | www.070139.com | www.611740.com | www.39380.com | www.503991.com | 882006.com | www.160337.com | www.729229.com | www.op52.com | www.cai8885.com | 166901.com | www.9841.net | www.059563.com | www.621515.cc | www.853595.com | 229833.com | 百姓彩票www.bxcp3.com | www.62000.cc | www.654744.com | www.859574.com | www.935131.com | www.964186.com | www.562581.com | www.984360.com | www.971904.com | www.129794.com | www.71cc.cc | 179424.com | 258045.com | www.306820.com | www.320232.com | www.82312.com | www.042420.com | www.333712.com | www.20795.com | 易彩网www.36166p.com | www.8fi.com | www.5570.cn | www.917676.cc | www.193514.com | www.535412.com | www.482456.com | www.508399.com | www.124187.com | www.120786.com | www.546281.com | www.433254.com | www.558232.com | www.444962.com | www.789099.com | 253860.com | www.jg68.com | www.252613.com | 975448.com | www.198572.com | www.354687.com | www.843080.com | www.899528.com | www.907030.com | www.350104.com | www.457785.com | www.3155.top | 608417.com | www.41915.com | www.066732.com | www.322596.com | www.270457.com | www.796481.com | www.020612.com | www.565339.com | www.939940.com | www.777779.com | www.991535.com | www.238325.com | www.933204.com | www.668274.com | www.og78.cc | www.094055.com | 499979.com | www.876906.com | www.kt7.com | www.083609.com | www.63103.com | www.3295.cn | www.25sq.cc | www.700939.com | www.442543.com | 873694.com | www.8303.wang | www.118779.com | www.318514.com | www.845775.com | www.837622.com | www.942789.com | www.170182.com | www.540610.com | www.875225.com | www.155280.com | www.875469.com | www.216685.com | 664949.com | www.051125.com | www.43xv.com | www.91pa.cc | www.576029.com | www.696608.com | bodog.vip | www.063811.com | www.030062.com | www.105249.com | www.pp94.com | www.7457.org | www.41kq.com | www.2145.vip | www.728548.com | www.776775.com | www.618926.com | www.801079.com | www.7042.pw | www.886539.com | www.4183.org | www.386535.com | www.905129.com | www.885497.com | www.015.tv | www.45675.cc | www.bh04.com | www.c38.com | www.cp301.com | www.089201.com | www.111119.cc | www.662630.com | www.21399.cc | www.9534.top | www.32031.com | www.346148.com | www.307858.com | www.0225.cn | www.42882.com | www.818587.com | www.905767.com | www.956565.com | 149490.com | www.148698.com | www.gy94.com | www.83499.com | www.65103.cc | www.86ir.com | www.8049.biz | www.826189.com | 837810.com | www.kt64.com | www.026891.com | www.428190.com | www.683801.com | 500万彩票www.01500w.com | www.5910.cc | www.365457.cc | www.300053.cc | 667147.com | www.15728.com | www.236511.com | www.157479.com | www.930961.com | 553035.com | 378895.com | www.185823.com | www.565553.com | www.723656.com | www.cai0622.com | www.960756.com | 09133.com | www.745917.com | www.881519.com | www.77373.cc | 974780.com | www.874285.com | www.198283.com | www.444875.com | www.231995.com | www.122994.com | www.356752.com | www.216958.com | www.593512.com | www.626455.com | 757844.com | www.28534.com | www.964666.com | www.689607.com | www.42146.com | 008104.com | www.7428.net | 361256.com | www.gl29.com | 中华彩票www.9149p.com | www.522282.com | www.883901.com | www.944342.com | www.027733.com | www.387443.com | www.612635.com | 555595.com | 365180.cc | 中国福利彩票www.33588k.com | www.62hq.com | www.378052.com | www.3vc.cc | 15660.com | www.867690.com | 630196.com | www.11hs.com | www.e30.net | www.390737.com | www.sl40.com | 750155.com | www.6278.cm | www.46at.com | 640089.com | www.715.cc | www.024268.com | www.020439.com | www.298263.com | www.654085.com | 096614.com | www.62ow.com | www.018393.com | www.687131.com | www.866938.com | www.071809.com | www.767979.com | www.995408.com | www.87ui.com | www.211140.com | www.gm22.cc | www.22563.com | www.130843.com | www.553884.com | 107213.com | www.913628.com | www.86165.com | www.tn2.com | 91vg.com | www.6vp.cc | www.966953.com | www.7370.org | www.121759.com | www.094664.com | 084554.com | www.xf08.com | www.161938.com | www.537578.com | www.338144.com | www.516882.com | 037981.com | 293272.com | www.84599.cc | www.281392.com | www.874956.com | www.960140.com | 696569.com | www.vi47.com | www.60vg.com | 560578.com | www.050460.com | 489826.com | www.809922.com | www.575840.com | www.26lj.com | 621032.com | www.677603.com | 06605.cc | 571913.com | 620932.com | www.395238.com | www.360362.com | www.493049.com | 920926.com | 017032.com | 733069.com | 淘彩票www.tcp969.com | 149451.com | 天天彩票www.2373w.com | 589620.com | 356449.com | www.369406.com | www.774302.com | www.5466.cm | www.5270.vip | www.8941.cn | www.549233.com | www.29102.com | 870799.com | www.316198.com | www.269595.com | 500彩票www.401271.com | www.is86.com | 云博彩票www.www.846662.com | www.711210.com | www.509837.com | www.640013.com | 43xo.com | www.754631.com | 七星乐www.535666e.com | www.242288.com | www.320169.com | 866023.com | 彩票坊www.022sx.cc | 525995.com | 983469.com | 274512.com | if83.com | www.974163.com | www.7052.biz | www.007176.com | www.1